Adding expiration times and interface for cached items

Signed-off-by: Ethan Wellenreiter <ewellenreiter@gmail.com>

backend/internal/storage/cache/cache.go

@@ -2,17 +2,42 @@ package cache
 
 import (
 	"context"
+	"time"
 
 	"git.ewellenr.ca/receipt_indexer/backend/internal/storage"
 	// auth_storage "git.ewellenr.ca/receipt_indexer/backend/internal/storage/auth"
 )
 
+const (
+	UserExpTime         = time.Minute
+	RolesExpTime        = time.Minute
+	GroupsExpTime       = time.Minute
+	UserGroupsExpTime   = time.Minute
+	ReceptsExpTime      = time.Minute
+	ReceiptImageExpTime = time.Minute
+)
+
 type Storage struct {
 	Users interface {
 		Get(ctx context.Context, id int64) (*storage.User, error)
 		Set(ctx context.Context, user *storage.User) error
 		Delete(ctx context.Context, userID int64)
 	}
+	Roles interface {
+		Get(ctx context.Context, name string) (*storage.Role, error)
+		Set(ctx context.Context, role *storage.Role) error
+		Delete(ctx context.Context, name string)
+	}
+	Groups interface {
+		Get(ctx context.Context, name string) (*storage.Role, error)
+		Set(ctx context.Context, role *storage.Role) error
+		Delete(ctx context.Context, name string)
+	}
+	UserGroups interface {
+		Get(ctx context.Context, userid int64) (*[]int64, error)
+		Set(ctx context.Context, groups *[]int64) error
+		Delete(ctx context.Context, userid int64)
+	}
 	Receipts interface {
 		Get(ctx context.Context, id int64) (*storage.Receipt, error)
 		Set(ctx context.Context, receipt *storage.Receipt) error